Friction draft-gear.



No. 865,391. PATENTED SEPT. 10, 1907.

J. J. HOFFMAN.

FRICTION DRAFT GEAR..

APPLICATION FILED JULIO, 1908.'

2 SHEETS-SHEET 1.

minessea:

No. 865,391. PATENTED; SEPT, 10, 1907.

J. J. HOFFMAN.

FRICTION DRAFT GEAR. AEPLIOATION FILED JULY9 .1906.

'2 saamswmm 2.

UNITED s'rrtrns PATENT rrron.

JOHN J. HOFFMAN, OF ST. LOUIS, MISSOURI, ASSIGNOR To PETER Hr MURPHY, OF ST. LOUIS MISSOURI.

" nmomon DRAFT-GEAR.

Specification of Letters Patent.

Patented Sept. 10, 1907.

Application and July 9,1906. Serial No. 325,197.

. United States, and a resident of the city of St. Louis and State of Missouri, haw invented a new and useful Im-. provernent in Friction Draft-Gears, of which the following is a specification. T

This inventionrelates to friction draft gears for railway. cars and'has for its frictional working parts; to provide an improved carrier and guide for the working parts of the draft gear ,and to attain certain other advantages hereinafter more fully set forth.

The invention consists in the parts and in the arrangements and combinations of parts hereinafter described and claimed.

.ln theaccoinpanying drawing, which forms part of this specification, and wherein like symbols refer to like parts wherever they occur,.Figure 1.is a view partly in section and partly in elevation showing the working parts of the draft gear in normal position; and also showing the position of the drawbar and yoke'in dotted lines;

,Fig. 2 is a top plan view with a portion of a sill in section; Fig. 3 is a vertical longitudinal section taken on the line 33 of Fig. 2, but showing the drawbar and yoke in side elevation; Fig. 4 is a detail perspective view of one of the cheek-plates; Fig. 5 is a detail per-.

spective view of the carrier casting; Fig. (i a detail perspective view of the securing bolt; Fig. 7 is a detail perspective view of the friction follower-block; Fig. 8 is a detail perspective View of the intermediate laterally movable friction blocks; Fig. 9 is a detail perspective view of the frictidn box-casting; and, Fig. 10 is a detail perspective view of thefollower-plate. The guide and carrier-for the draft gear comprises flanged cheek-plates] which are adapted to be secured to the draftsills 2 of a car. These cheek-plates are preferably castings formed with openings 3 to reduce their Weight A flange 4 is provided along'the upper inner edgeof each of the cheek-plates. Vertical flanges 5 are formed on the inner face of said c-heeleplates hour each end thereof and are suitably braced by webs (3 which terminate at outer ribs 7 as at the ends of the plates. Said flanges 5 serve as limit stops for the followers or niovable abutnients of the frictiongear. Each of the said registering perforations and is threadedat its ends to receive locking nuts 15. The cheek-plates are prefprincipal objects to simplify theerably formed with integral bosses or extensions 1 6 on their outer faces, that is, the faces adjacent to the draft sills. The bosses 16 are adapted to be set into suitable recesses in the draft sills, and have holes therethreug'h.

.The innermost portions ofsaid-holes are enlarged and squared to receive and prevent the rotation of the rectangiilar heads of securing bolts. 1-8, which are passed through said holes in the bosses and alining holes in the draft sills, The heads of the bolts are received in the square depressions 17which are of a suflicient depth to allow the bolt-heads to clear the inner face of the cheek- Loeking nuts 19 are fitted on the ends of the bolts 18. Perforations 16 are also formed in the cheekpl ates 1 for the reception of additional securing bolts- 18". In order to readily place the carrier frame in position or to remove the same from the cheek-plates, notches 20 are formed in the side members 11. These notches are of a sufficient depth to clear the lugs 9 on the cheek-plate extensions 8 when the carrier frame is lifted between said cheek-plates. In placing the carrier frame in position, it is placed with the notches in alinement with the lugs 9 at either end of the cheek-plates and lifted until theside members 11 clear said lugs, and

then moved longitudinally untilthe end members 12 rest upon the lugs 9. Then the perforations 10 and 13 are made to register and the securing bolts are placed in position. i i

The frictional working parts comprise a friction follower-block 21 having parallel side extensions 22 at its ends. The ou er endsof the side extensions 22 are each formed with a reentrant angle to provide inclined. faces 23, and the body of the block is preferably formed with strengthening ribs 24. I t

A box-casting 25 is mounted to slide longitudinally between he .cheeleplat-es 1. This box casting is formed with parallel side extensions 26 the ends of which have reentrant angles to form inclined faces 27 correspomling to the faces 23 on the follower block 21. Intei'posed betweenthe follower-block 21 and the boxcasting 25 are two vertically movable friction blocks 28. These friction blocks are counterparts whose ends are formed with inclined faces. 29 which are adapted to abut against and frie' onally engage said inclined faces 23 and 27 on the follower-block and box-casting, respectively. Said vertically movable friction blocks are hollowed out, as indicated at 30 inFig. 8, to provide seats for a compression spring '31. The tendency of said spring is to normally force he friction blocks apart. l I

The movable box-casting 25 is'adapted to receive a spring 32. One end of the spring 32 abutsagainst the inner face of the front wall of the box-casting, and the opposite end of said spring abuts against a followerfi plate 33 which is mounted-to slide longitudinally between the cheek-plates. Normally the follower-plate 2]. which is held against In eonse uenee of the friction 33 bears against its limit stops 5 on the eheek-plates l at a short distanee beyond the end of the boxa'asting. The normal position of the frietion lollowoebloek 2i is also against its limit. stop on the eheekplate, both said block and said follower-plate being normally kept against their respective stops by the spring 552.

As shown in dotted lines in Figs. l and and in full lines in Fig. 3, a yoke 34 of looped around the working, parts of the gear. of the yoke are riveted to the drawbar 35 in the usual manner. Normally the looped end portion oi the voke engages the iollowenplate 33, and the end ol' the drawliar engages the frietion follower-lilot'k :2 l.

' In the operation of the dral't gear. a pull upon the drawbar will be transmitted through the yoke to the follmver-plate 33, \Vlii('ll will tend to 'oompress said spring32. .A strong pull upon thedrawluir will eause the tollower-plate 33 to eompress the sprint: and abut. against the end ot'the box-tasting 25. The l'oreeot The ends the continued pull is transmitted through said boxcasting and the friction blot-ks 28 to tho follower-block on the eheek-plates.

lanes of the l'rietion-bloeks 28, being inelined tho ion gitudinal stress thereon has'a transverse eo'mponent.

which tends to force said l'rietion bloeks towards eaeh other against; the fort-e ol' their spring 33 In el't'oeting this movement the hloeks are made to slide along the adjacent faces of the box-(tasting and ot' the lollo\ver block, which aotion produees a great amount. of t'riet ion. When the drawbar is relieved iroin the pulling stress, the springs 31 and 32 will restore theworking parts to normal position.

By the eonstruetion and arrangements hereinv described, a simple and etl'eetive meehanism is prodin 'ed. All undue pulling stress is initially taken up by the follower 33 and tin-ally by the l'rietion bloeks 28 and spring 3,], the action being eontrolled by the angnlarity of the inelined trietion surfaces whieb ean be varied to suit. different conditions. I

movement by the limit stops any suitable eonstrnetion is 1 i l i i l t l l l l l l butlitrg, aetion olihe gear is substantially the l'o1lo\ve:' plate The same as the drat't aetion, ext-opt that the 33 serves as the abutment and the l'riet'ion tolloweetherefore i do tint wish to be limited to the speeitie 'eonstiui'tion shown and deserihed.

What I elaim as my invention and desire t by Letters Patent is:

i. A euide and earrier t'or drat't eoar eoinprisini: eheelt plates having upper flanges, enii tlanges eonslitutine' limit stops. and supportinu hr :1 earrier frame adapted to i-ost upon said supporting la s between 'iid eheeleplates. aid earrier' t'rame eonlpri in inteural angular side liars and ehannol end bars. said eheeleplates and said earlier trauie being provided with alinin; perforations, and bolts for eeut'ing' said arrier t'rame to said eheeh-plates. said bolts being passed through said aliniue' perforations.

o seeure lltlVlllil top llanues. end flanges prorided -\\'ith reinand depending plate. tort-me r: s amt eonstituting limit stops. extensioi havingsupporting lugs l'ormed thereon. and also provided with perforations, a earrier l'ranie adapted to r st upon "lltl supportinzv lug: said carrier t'rame enmpri lug: integral angular side bars and elianuel end bars. said side bars being proridod with perforations near the nds in alineinent with the ehannel of mid end hars.':ind adapted to aline with the perforations in said elieeleplate eapable oi eonsiderable extensions. and bolts adapted to he passed through said alinin: perforations to seenre said earrier frame tp saiti v'ilt tlidllzlll'hZ St, Louis. Missouri, July lj. llitlli.

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